Histological study of the development and sex differentiation of the gonad in the European eel
The histological structure of the gonads was studied in yellow eels sampled from a coastal lagoon and from stocks reared in an aquaculture plant showing different sex ratios. Gonad development related to body size rather than to age and underwent an intermediate stage characterized by a structure of...
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Online Access: | http://hdl.handle.net/11392/1203683 https://doi.org/10.1111/j.1095-8649.1996.tb01443.x |
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ftunivferrarair:oai:iris.unife.it:11392/1203683 2024-02-11T09:55:34+01:00 Histological study of the development and sex differentiation of the gonad in the European eel COLOMBO, Giuseppe GRANDI, Gilberto Colombo, Giuseppe Grandi, Gilberto 1996 STAMPA http://hdl.handle.net/11392/1203683 https://doi.org/10.1111/j.1095-8649.1996.tb01443.x eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:A1996UF79700015 volume:48 issue:3 firstpage:493 lastpage:512 journal:JOURNAL OF FISH BIOLOGY http://hdl.handle.net/11392/1203683 doi:10.1111/j.1095-8649.1996.tb01443.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-28644448575 Anguilla anguilla gonad development sex-differentiation histological analysis info:eu-repo/semantics/article 1996 ftunivferrarair https://doi.org/10.1111/j.1095-8649.1996.tb01443.x 2024-01-17T17:33:36Z The histological structure of the gonads was studied in yellow eels sampled from a coastal lagoon and from stocks reared in an aquaculture plant showing different sex ratios. Gonad development related to body size rather than to age and underwent an intermediate stage characterized by a structure of an early testis but containing oogonia and oocytes. This gonad was called the Syrski organ and the stage juvenile ambisexual. Ovaries were found in eels from 22-30 cm in length, possibly derived from undifferentiated gonads or from Syrski organs. Fully differentiated testes were found in eels >35 cm, derived from Syrski organs. These observations support the results of previous research. From elvers and in eels up to 15-16 cm in length, growth of the gonadal primordium is due to primordial germ cell migration. In eels > 15 cm multiplication of primordial cells begins. Oogonial clones were found in eels > 18 cm in length, while spermatogonium B clones were observed in eels >30 cm in length. The dynamics of sex differentiation was different among stocks with different ultimate sex ratios: ovaries were found in shorter eels in stocks with a prevalence of females, in longer eels in stocks with a prevalence of males. This result supports the hypothesis of a metagametic (environmental) sex determination. The somatic cells in contact with germ cells and those in the interstitium appeared early during gonad development and preceded germ cell differentiation. This suggests that somatic cells are the targets of the environmental factors influencing sex differentiation. Article in Journal/Newspaper Anguilla anguilla Università degli Studi di Ferrara: CINECA IRIS Journal of Fish Biology 48 3 493 512 |
institution |
Open Polar |
collection |
Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Anguilla anguilla gonad development sex-differentiation histological analysis |
spellingShingle |
Anguilla anguilla gonad development sex-differentiation histological analysis COLOMBO, Giuseppe GRANDI, Gilberto Histological study of the development and sex differentiation of the gonad in the European eel |
topic_facet |
Anguilla anguilla gonad development sex-differentiation histological analysis |
description |
The histological structure of the gonads was studied in yellow eels sampled from a coastal lagoon and from stocks reared in an aquaculture plant showing different sex ratios. Gonad development related to body size rather than to age and underwent an intermediate stage characterized by a structure of an early testis but containing oogonia and oocytes. This gonad was called the Syrski organ and the stage juvenile ambisexual. Ovaries were found in eels from 22-30 cm in length, possibly derived from undifferentiated gonads or from Syrski organs. Fully differentiated testes were found in eels >35 cm, derived from Syrski organs. These observations support the results of previous research. From elvers and in eels up to 15-16 cm in length, growth of the gonadal primordium is due to primordial germ cell migration. In eels > 15 cm multiplication of primordial cells begins. Oogonial clones were found in eels > 18 cm in length, while spermatogonium B clones were observed in eels >30 cm in length. The dynamics of sex differentiation was different among stocks with different ultimate sex ratios: ovaries were found in shorter eels in stocks with a prevalence of females, in longer eels in stocks with a prevalence of males. This result supports the hypothesis of a metagametic (environmental) sex determination. The somatic cells in contact with germ cells and those in the interstitium appeared early during gonad development and preceded germ cell differentiation. This suggests that somatic cells are the targets of the environmental factors influencing sex differentiation. |
author2 |
Colombo, Giuseppe Grandi, Gilberto |
format |
Article in Journal/Newspaper |
author |
COLOMBO, Giuseppe GRANDI, Gilberto |
author_facet |
COLOMBO, Giuseppe GRANDI, Gilberto |
author_sort |
COLOMBO, Giuseppe |
title |
Histological study of the development and sex differentiation of the gonad in the European eel |
title_short |
Histological study of the development and sex differentiation of the gonad in the European eel |
title_full |
Histological study of the development and sex differentiation of the gonad in the European eel |
title_fullStr |
Histological study of the development and sex differentiation of the gonad in the European eel |
title_full_unstemmed |
Histological study of the development and sex differentiation of the gonad in the European eel |
title_sort |
histological study of the development and sex differentiation of the gonad in the european eel |
publishDate |
1996 |
url |
http://hdl.handle.net/11392/1203683 https://doi.org/10.1111/j.1095-8649.1996.tb01443.x |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:A1996UF79700015 volume:48 issue:3 firstpage:493 lastpage:512 journal:JOURNAL OF FISH BIOLOGY http://hdl.handle.net/11392/1203683 doi:10.1111/j.1095-8649.1996.tb01443.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-28644448575 |
op_doi |
https://doi.org/10.1111/j.1095-8649.1996.tb01443.x |
container_title |
Journal of Fish Biology |
container_volume |
48 |
container_issue |
3 |
container_start_page |
493 |
op_container_end_page |
512 |
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1790597463277568000 |